Where Does the Question Mark Go When Listing the Options to Choose From?

For example, I’m trying to ask someones opinion on what to choose when there are two alternatives. Like, "Which one is better, selling it or keeping it?", but I’m not sure if this is the correct way to punctuate this sentence. Couple ways I can think of are:

1. Which one is better, selling it or keeping it?
2. Which one is better; selling it or keeping it?
3. Which one is better? Selling it or keeping it?

I’d normally go with the first one but it looked weird when I formed a sentence like this "When there is a problem with your car, what is better, selling it or repairing it?"

I know I can form the sentence in a different way, such as "Is selling your car better than repairing it when there is something wrong with it?", so that I need to use less punctuation. However, I want to learn how to form this since I hear it a lot in daily life. Thanks a lot in advance.